Q Power 2 Hole 12" Subwoofer Enclosure Box for 2004-2008 F-150 XCab/Super Crew Fits 2004-2008 Ford F-150 Extended Cab and Super Crew Vehicles 2 Hole Design for 12" Subwoofers Underseat Downfiring Design Finished with a Durable Bed Liner Coating Air Space: 0.7 Cubic Ft (per subwoofer)